Sium

This is a very simple alternative to attachment mod. 
It works only with images and allows users to quickly add images to posts. 
All images are stored on third party image hosting service and bbcode for 
images is automatically inserted in posts when users upload images. 
Thumbnails are automatically created on image hosting server. 
This mod is very easy to install and very easy to use.
Other options and language settings are available here: <a href="http://postimage.org/mod.php" rel="nofollow ugc">http://postimage.org/mod.php</a>
Powered by <a href="http://postimage.org/" rel="nofollow ugc">Postimage.org</a>

Simple Image Upload

This mod integrates image hosting with WordPress

Oberon Lai

Media with FTP can manage the media files of remote image hosting throught FTP connection. Uploading and deleteing remote files in the WordPress Media Library directly.
Configuring the FTP connection in admin option page, also you can assign the images path in the panel.
A few notes about the option fields:
<ul>
<li>“FTP Host Name” is the URL or IP address of FTP connection for you image hosting.</li>
<li>“FTP Port” is the FTP port number and it’s usually 21. Keep the default value if you don’t know what it is.</li>
<li>“FTP Username” is the username of FTP connection.</li>
<li>“FTP Password” is the password of FTP connection.</li>
<li>“FTP Root Path” is the images’ folder path in your image hosting, and it also replaces the image url which upload from media library on your web site.</li>
<li>“FTP Folder Path” is the folder saving files in image hosting. Keeping the default value “/” if your “FTP Root Path” is pointed to the image folder. You can change it after adding the folder on the image hosting.</li>
</ul>
The source code was made by Pontus Abrahamsson from <a href="https://github.com/pontusab/wp-ftp-media-library" rel="nofollow ugc">https://github.com/pontusab/wp-ftp-media-library</a>. This plugin integrates the function of deleting remote server files and the visual options page for non-developer user, also making the plugin structure with WordPress plugin boilerplate with OOP.
Let me know if any questions, enjoy!

Media with FTP

Let's you upload images to ftp-server and remove the uploads in the WordPress Media Library.

Simple Image Upload vs Media with FTP